iHP Manual 63 | P a g e
4.2.2.6.5 ACOK Signal “Power Fail” (Uncommitted Transistor)
This signal indicates that the input AC is within operational range of the unit. ACOK- “Emitter” and ACOK+
“Collector” signal functions as an AC OK signal. These signals are connected to an uncommitted transistor.
AC is Ok when the transistor is On.
AC is not Ok when the transistor is Off.
The max sink current is 50mA for ACOK transistor and the bias resistor should be chosen to limit current to a
maximum of 50mA. The recommended supply voltage is 5V. Possible circuit configuration for AC OK signal is
shown in Figure 4-12.
Figure 4-12 Possible circuits configuration for ACOK functionality
4.2.2.6.6 DCOK Signal “Output Fail” (Uncommitted Transistor)
This signal indicates that all modules are on and functioning properly. The signal will be de-asserted when at
least one module turns off via fault or inhibited by the system. DCOK- “Emitter” and DCOK+ “Collector” signal
functions as DC OK signal. These signals are connected to an uncommitted transistor.
When all output of module is Ok, the transistor is On.
When all output of module is not Ok, the transistor is Off.
The max Sink current is 50mA for DCOK transistor and the bias resistor should be chosen to limit
current to a maximum of 50mA. The recommended supply voltage is 5V. Possible circuit configuration for
DCOK signal is shown in Figure 4-13.
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